Mucosal thickening and mucosal antral cyst (MAC) in the maxillary sinus are incidental findings in panoramic radiographs.
Methods. The study sample consisted of 5021 participants in a nationally representative Health 2000 Health Examination Survey using panoramic radiography.
Results. The prevalence of mucosal thickening was 12% and of MACs 7%, both being twice as frequent in men
as in women. Mucosal thickening was most common in the 40- to 49-year age group, whereas MACs were most often seen in younger age groups. Pathologic dental findings and root canal treatments were significantly associated with mucosal thickening but not with MACs. The odds ratios of vertical infrabony pockets were 5.2-fold compared with edentulous.
Conclusion. This nationally representative study indicates that dental infections are etiologic for antral mucosal thickening, Epigenetic inhibitor mw but not for MACs. (Oral Surg Oral Med Oral Pathol Oral Radiol
Endod 2010; 109: e80-e87)”
“Assuming an idealized piezoelectric bulk acoustic wave resonator, one typically calculates the velocity of the fundamental bulk acoustic mode as the measured frequency times twice the thickness of the piezoelectric film. In c-axis 6mm hexagonal crystals of (e.g., ZnO or AlN), both the longitudinal and thickness shear modes are peizoelectrically active using thickness excitation and lateral-field excitation, respectively. Without a loss of generality, we concentrate our study on ZnO films. The theoretical velocity of the pure thickness shear mode in sputtered ZnO, based strictly on reported MS-275 cost material properties, is calculated MRT67307 datasheet to be approximately 2580 m/s. However, a variety of acoustic velocities for the thickness shear mode in ZnO have been reported in the literature ranging from about 3100-3500 m/s. These reported values represent a 20%-36% increase in acoustic velocity relative to the theoretical values. In the literature, this deviation is typically attributed to ZnO film inconsistencies and other phenomena which can be difficult to
quantify. We propose that the reported inconsistencies may be attributed to a hybrid acoustic mode comprised of a coupling of shear and longitudinal particle displacements. In this paper, we present a theoretical description of a hybrid mode in ZnO solidly mounted resonator (SMR) devices. We begin first with an experimental verification of a mode with a changing velocity in a ZnO SMR with the only variable being the ZnO thickness. Using the acoustic velocity through the thickness as an effective velocity with which to reference the mode, we find the effective acoustic velocity to range from 3100-3900 m/s, with increasing ZnO thickness. We then start from the first principles of piezoelectric acoustic wave propagation and derive three coupled partial differential equations describing a hybrid mode comprised of the coupling between longitudinal and shear particle displacement and the corresponding piezoelectrically generated potential in the ZnO film.